The Muscle Metric Your Annual Physical Skips

Every year you get your cholesterol checked. Your blood pressure. Maybe an A1c if your doctor is paying attention. But almost no one gets the one number that predicts how you'll actually move, live, and feel in your 70s: how much muscle you have right now.

Here's the part that surprises most patients when I bring it up: muscle isn't just about strength. It's metabolically active tissue — it's where you store the glucose you eat, it's a huge part of what keeps your resting metabolism from tanking as you age, and it's the single best predictor we have of whether someone stays independent later in life or doesn't. And starting somewhere in your 30s or 40s, most adults lose about 3-8% of their muscle mass per decade if they don't actively work against it. That loss accelerates after 60. By the time it's showing up as "I used to be able to carry both grocery bags at once" — you've already lost a lot of ground.

The frustrating thing is that muscle loss is quiet. You don't feel it happening the way you feel your energy drop or your knee start to ache. You feel the downstream effects — years later, after the trajectory is already set.

So What Does This Mean for You Right Now?

If you're 45-65, this is arguably the single highest-leverage thing you can do for your future self, and it's more within your control than almost anything else on a longevity checklist. Two things matter most:

1. Resistance training, consistently. Not "someday when I have more time" — the research is clear that even two structured sessions a week, done well, meaningfully changes your trajectory. This isn't about looking a certain way. It's about the muscle you'll need to get off the floor easily at 78.

2. Protein intake that actually matches your needs. Most adults in this age range are eating less protein than their body needs to preserve muscle, especially as the body becomes less efficient at using dietary protein with age. This is one of those things where "eating healthy" in the generic sense isn't the same as eating in a way that protects muscle specifically.

The piece that's hardest to do on your own is knowing where you actually stand. Strength is one data point, but body composition — how much of you is muscle versus fat, and where that fat is distributed — tells a more complete story, and it's something we can measure precisely rather than guess at from a scale number or a mirror.

That's part of why we offer Body Composition Analysis at ERAs — it gives you an actual baseline instead of a feeling, so you know whether what you're doing is working, and where to adjust if it isn't.

You don't need to become someone who lives in a gym. You need a plan built around where your body actually is today, not a generic one pulled from a fitness app. If you're curious what your own numbers would show, that's a conversation worth having.

Want to know where you stand? Book a visit to talk through your options.